Broaching tool



BROACHING TOOL Filed Feb.l 4. 1922 Patented Uec. ll, i923.

JOHN 0.y JENKNG, OF DETROIT, MICHIGrlSl'.

BROACHING TOOL.

Application lediebruary e, Serial No. 534,217. y l

T 0 all whom t may concern.:

Be it knownthat I, JOHN O'. JENKING, citizen of the United States, residing at Detroit, county of Wayne, State or Michigan, have invented a certain new and useful Improvement in Broaching Tools; and declare the following to be a full, clear, and exact description of the same, such. as will enable others skilled in the art to which it pertains to make and use the same, reference being had to the accompanying drawings, which Jform a part of this specification.

My invention relates to breaching VJtools shown in the accompanying drawings and more particularly described' inthe following speciication and claim.

It is well known that when the cutters v sleeved thereon, so that when the cutters are worn or broken they may be replaced to prolong the life of the tool. So also the shank or mandrel may be made of a different grade of tool steel from the cutters sleeved thereon thus greatly reducing the cost of manufacture.

With the foregoing and other objects in view which will appear asthe description proceeds the invention further resides in the combination and arrangement of parts and in the details of construction hereinafter described and claimed, it being understood that changes may be made in the preciseembodiment of the inventionl herein disclosed without departing from the spirit of the same.

In the drawings accompanying this speciiication:

Figure l is a side elevation of a broaching tool with parts broken away.

Figure 2 is an end elevation of the same ,viewed from the end of the tool itted .with

a nut.

Figure 3 is a side elevation of the mandrel shown in Figure l with the cutters, pilot, burnisher and the retaining nut removed. l

Figure 4 is an end elevation of the same as viewed from the threaded end or" the mandrel. l

Figures 5 and 6 are side and front elevationsoi a fiber washer located between-'thel cutters sleeved upon the mandrel.

Figure 7 is a cross-sectional view of a mandrel having a round shankJ to :recieve the cutters taken on or about line 7 7 ofV Figure 3. l

Figure 8 is a similar sectional view y,of av modification indicating a shank k elliptical in cross-section. v y

Figure 9 is aside elevation of the nut` for securing the cutters upon the shank of the mandrel.

Figure 10 is anl end elevation ofthe same, showing the flattened portion lto receve'a Figure la is an end elevation of the cutters.

. Figure l5 is a side elevation of a remov? able burnishing mandrel.

Figure 16 is an end elevation of the same.

Figure 17 is a side elevation of a pilot for an angular broach-with parts broken away. v

Figure 1,8 is an end elevation of thesame Figure 19 is a side yelevation of a group of three integral cutters for broaching an angular hole.

, wrench. l y

Fig. ll is a side elevation of the'pilotv showing a portion broken away. i FigurelQ is anendfelevation of the same. Figure 13 is a side elevation of a group of three integral cutters.

Figure 20 is an end elevation of the same showing the lcentral elliptical opening to receive the corresponding shank of thesupporting mandrel. f. v i

Figure 2l is a side elevation of a detachable burnishing member for angular breaching tools. Y

, Figure 22 is an end elevation ofthe same.

Referring now to the letters of reference placed upon the drawings:

A, indicates a mandrel having a head A slotted at A2 for the passage of a transverse key to connect the mandrel with an operating member-not shown. Thev shank of the mandrel is threaded at A3 to receive a nut. B, is a pilot sleeved upon the shank and beveled at the. ends as indicated at B; C, is a plurality of cutters which may be in integral groups of any desired number g-the drawings showing groups of three cutters, between which may be sleeved iberwashers D if desired. E, indicates a burnishing collar sleeved upon the shank and F is a nut,-- flattenedsat oppositensides as at. F to re.- ceiveI a Wrench-screwed tovthe threaded end A3 of the shank to secure the several elements thereon. The mandrel indicated in Figure 3 has a circular shank,l an elliptical shank Aa may be employed as indicated in Figure 8, to secure the cutters against rotation thereon. drawings are in groups of three, it Will be obv-ions however that'a-plurality of single cutters may bei-employed or f any desired number of'cutters 'may form* an integral unit. Y

To v'provide for broacliing"A a square lhole a po'lygonalpilot Ba, shown inFigures 17A and 18 is employed With correspondingly shaped cutters Ca, as shown in'Figures YILS-and 2O are used in place otther'circular cutters C illustrated in Figures 13 and 14,-ancl-so also a square burnishing tool Ev(see Figure 2l) is provided having an arc-shaped tace El), extending longitudinally of the breach.

Having indicated the several parts by reference letters the construction and operation of the device will be readily undei-stood.

For convenience in assembling the cutters they may be arbitrarily marked to indicate The cutters shown' in l. thek the size, and numbered consecutively that they may be properly assembled for size and taperz--the group of cutters olsmallest diameter being nearest the head of the breaching tool and so on. It one of the cutters should become broken or damaged it is only necessary to remove that particular group for replacement by another group. The life of the tool. is thus greatly increased over the usualy breaching tool f with a corresponding reduction in cost. p

Having thus described my invention -what I claim 'isz' Abroaching tool comprising a mandrel having an `enlarged .head at one end and threaded at its opposite end'to `receive anut,

a pilot sleeved upon thezmandrel adj acentv to the enlarged head, a plurality of `groups of integral cutters sleeved upon theI mandrel, an arc-shaped burnishing element sleeved upon the mandrel adjacent itsv screw-threadf ed portion, and a fnutfengaging the@ screwtlireaded==portion oft theV mandrel to secure thev several elements' thereon.

In testimony Wli'ereoil signithis specification in thepresenceor two Witnesses. y

J OH'N O. J ENKING. Witnesses:

S. E; THOMAS, JOHN CoNsmINn,l 

